diff --git a/src/ast.rs b/src/ast.rs
index 02e1067..3e26c6a 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -17,7 +17,7 @@ pub struct FunDecl {
 }
 
 /// The declaration of a class member.
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum ClassMemberKind {
     Method,
     Getter,
diff --git a/src/resolver.rs b/src/resolver.rs
index a5116c4..aa73729 100644
--- a/src/resolver.rs
+++ b/src/resolver.rs
@@ -268,7 +268,7 @@ where
 /// Determine which error should be returned if the specified class member is
 /// a duplicate.
 fn class_member_uniqueness_error(member: &ClassMemberDecl) -> &'static str {
-    match (member.kind, member.is_static) {
+    match (&member.kind, member.is_static) {
         (ClassMemberKind::Method, _) => "duplicate method",
         (ClassMemberKind::Getter, true) => "duplicate static property getter",
         (ClassMemberKind::Getter, false) => "duplicate property getter",
@@ -277,25 +277,16 @@ fn class_member_uniqueness_error(member: &ClassMemberDecl) -> &'static str {
     }
 }
 
-/// Determine the parameters that will be used when "calling" the specified
-/// class member. Methods will follow the parameters specification, getters
-/// will receive no parameters, and setters will receive a parameter named
-/// after the setter itself.
-fn class_member_parameters(member: &ClassMemberDecl) -> &[Token] {
-    match member.kind {
-        ClassMemberKind::Method => &member.fun_decl.params,
-        ClassMemberKind::Getter => &[],
-        ClassMemberKind::Setter => &[member.fun_decl.name],
-    }
-}
-
 /// Process a class member's definition. A set is used to identify potential
 /// duplicates.
 fn resolve_class_member<'a, 'b>(
     rs: &mut ResolverState<'a>,
     member: &'b ClassMemberDecl,
     uniqueness: &mut HashSet<(ClassMemberKind, bool, String)>,
-) -> ResolverResult {
+) -> ResolverResult
+where
+    'b: 'a,
+{
     let is_init = member.kind == ClassMemberKind::Method
         && !member.is_static
         && member.fun_decl.name.lexeme == "init";
@@ -310,7 +301,7 @@ fn resolve_class_member<'a, 'b>(
 
     if uniqueness.insert((member.kind, static_key, member.fun_decl.name.lexeme.clone())) {
         rs.with_scope(
-            |rs| resolve_function(rs, class_member_parameters(member), &member.fun_decl.body),
+            |rs| resolve_function(rs, &member.fun_decl.params, &member.fun_decl.body),
             scope_type,
         )
     } else {